Method of manufacturing packaging and wrapping film

Details Method of manufacturing packaging and wrapping film Method of manufacturing packaging and wrapping film

1995-06-07

1997-01-07

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Direct application of fluid pressure

15624414, 15624417, 264471, 264514, 264567, 26417128, 26417314, 26417315, 26433117, 264342R, B29C 3510

Patent

active

055913903

ABSTRACT:
A method of manufacturing a multilayer heat-shrinkable, puncture-resistant biaxially oriented film is disclosed. The method includes a double bubble orientation step and extruding a primary tube that includes at least one substantially linear ethylene homopolymer or interpolymer, wherein the substantially linear ethylene homopolymer or interpolymer has an uniform branching distribution, a melt flow ratio, I.sub.10 /I.sub.2,.gtoreq.5.63, and a molecular weight distribution, M.sub.w /M.sub.n, defined by the equation M.sub.w /M.sub.n .ltoreq.(I.sub.10 /I.sub.2)-4.63, and is also characterized as having essentially no linear polymer fraction, a single DSC melting peak, a density greater than about 0.85 g/cc, and a favorable gas extrusion critical shear rate at the onset of surface melt fracture.

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